Sökning: "membran"

Visar resultat 1 - 5 av 135 avhandlingar innehållade ordet membran.

  1. 1. Experimental Studies on CO2 Capture Using Absorbent in a Polypropylene Hollow Fiber Membrane Contactor

    Författare :Yuexia Lu; Jinyue Yan; Erik Dahlquist; Umberto Desideri; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; CO2 capture; Simultaneous removal of CO2 and SO2; Hollow fiber membrane contactor; Membrane gas absorption; Partial wetting; Surface modification; CO2-avskiljning; samtidig avskiljning av CO2 och SO2; ihålig fiber; membran; gas absorption; vätning; ytmodifiering; Energy- and Environmental Engineering; energi- och miljöteknik;

    Sammanfattning : In recent years, membrane gas absorption technology has been considered as one of the promising alternatives to conventional techniques for CO2 capture due to its favorable mass transfer performance. As a hybrid approach of chemical absorption and membrane separation, it exhibits a number of advantages, such as operational flexibility, compact structure, high surface-area-to-volume ratio, linear scale up, modularity and predictable performance. LÄS MER

  2. 2. Electrochemical properties of alternative polymer electrolytes in fuel cells

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Annika Carlson; Rakel Lindström; Göran Lindbergh; Carina Lagergren; Mohamed Mamlouk; [2019]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fuel cell; anion exchange membrane; proton exchange membrane; electrode morphology; hydrogen oxidation reaction; water transport; poly phenylene oxide ; cellulose; bränslecell; anjonledande membran; protonledande membran; elektrodstruktur; vätgasoxidation; vattentransport; poly fenylenoxid ; cellulosa; Chemical Engineering; Kemiteknik;

    Sammanfattning : Fuel cells, using hydrogen as energy carrier, allow chemically‑stored energy to be utilized for many applications, including balancing the electrical grid and the propulsion of vehicles. To make the fuel cell technology more accessible and promote a sustainable energy society, this thesis focuses on alternative polymer electrolytes, as they can potentially lead to a lower cost and a more environmentally‑friendly fuel cell. LÄS MER

  3. 3. Fouling of Ultrafiltration Membranes due to Adsorption of a fatty acid

    Detta är en avhandling från Chemical Engineering, Lund University

    Författare :Jeanette Lindau; [1998]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ultrafiltration Fouling Adsorption Characterisation ESCA FTIR SEM-EDX Ellipsometry Cleaning Capillary condensation; Chemical technology and engineering; Kemiteknik och kemisk teknologi;

    Sammanfattning : A study of fouling of ultrafiltration membranes due to adsorption of a fatty acid in the membrane matrix has been done. Octanoic acid was used as a model substance. LÄS MER

  4. 4. New directions in non-porous membrane extraction

    Detta är en avhandling från Department of Analytical Chemistry, Lund University

    Författare :Eddie Thordarson; [2000]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; extracting syringe; solvent-free; miniaturisation; micro-porous membrane liquid-liquid extraction; polymeric membrane extraction; Non-porous membrane extraction; supported liquid extraction; integration; automation; Analytical chemistry; Analytisk kemi;

    Sammanfattning : Complex biological and environmental samples require a high degree of selectivity in order to determine components therein. Sensitivity measures, such as analyte pre-concentration are often required for assessing composition quantitatively. LÄS MER

  5. 5. Electrochemical evaluation of new materials in polymer electrolyte fuel cells

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Björn Eriksson; Carina Lagergren; Göran Lindbergh; Rakel Lindström; Piotr Zelenay; [2019]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fuel cell; Pt-REM; Alloy catalyst; Multi walled carbon nanotubes; Bipolar plates; Water transport; Bränslecell; Pt-REM; Legerad katalysator; Flerväggade kolnanorör; Bipolära plattor; Vattentransport; Chemical Engineering; Kemiteknik;

    Sammanfattning : Polymer electrolyte fuel cells (PEFC) convert the chemical energy in hydrogen to electrical energy and heat, with the only exhaust being water. Fuel cells are considered key in achieving a sustainable energy sector. The main obstacles to wide scale commercialization are cost and durability. LÄS MER